Air pump



F. A. JOHNSON.

AlR PUMP. APPLICATION FILED MAY 3,,1'921.

1,436; l 75. Patented Nov. 21, 1922.

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Patented Nov. 21, 1922.

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FRANK A. JOHNSON, or AURORA, ILLINOIS.

AIR PUMP.

Application filed May 3, 1921.

To all whom it may concern.

Be it known that I, FRANK A. JoHNsoN, citizen of the United States,residing at Aurora, in the county of Kane and State of Illinois, haveinvented certain new and useful Improvements in an Air Pump, of whichthe following is a specification.

This invention relates to an air pump and has for its principal objectto provide a device of this nature which will be of extremely simple,durable and inexpensive construction, one which is efficient andreliable in operation, and well adapted to the purpose for which it isdesigned.

With the above and numerous other objects in view, the invention residesin certain novel features of construction, and the combination andarrangement of parts as will be hereinafter fully described and claimed.

In the drawing Figure 1 is a side elevational view of the pump showingportions thereof in section, and

Figure 2 is an end elevation thereof.

Referring to the drawing in detail it will be seen that 1 designates thefoot plate which is provided at one end with the spaced parallel lips 2which are provided with registering apertures for receiving the bolt and3 for pivotally supporting the standard 4. A pair of plates 5 aresuitably fixed to the standard 4: adjacent its lower end for pivotallyreceiving the links 6 one of which supports the cylinder 7 while theother supports the cylinder 8. The cylinder 8 1s adapted to be of asmaller diameter than the cylinder 7 A clamp 9 comprising the sleeve 10and the two spaced apart parallel flanges 11 is pivotally connected totop terminal of the standard 4:. The handles 12 and 13 are in the sleeve10 while the piston rods 14 are pivotally mounted between the flanges 11adjacent their ends. These piston rods 14 extend through the closures 15of the cylinders 7 and 8 and are provided with pistons which are adaptedto slide in these cylinders.

Each piston consists of the disk 16 and washer 17 between which issupported the flexible member 18. The disk 16 is of smaller diameterthan the corresponding cyl- Serial N0. 466,471.

inder and the washer 17 is smaller than the disk 16 whereas the flexiblemember 18 has a diameter larger than that of its corresponding cylinderso that it will assume a saucer shape as indicated in the drawings. Anaperture 19 is provided in the closure 15 of cylinder 17. A hose 20connects the bottom of cylinder 7 with the bottom of cylinder 8 and acheck valve 21 is situated therein so as to allow the air to pass in thedirection shown by the arrows but not in the opposite direction. Anotherhose 22 is in communication with the cylinder 8 through its bottom-andis provided with the check valve 23 so as to allow the air to pass inthe direction indicated by the arrows but not in the opposite direction.

From the above detailed description it will be seen that by pushingdownwardly upon handle 12 the air in cylinder 7 will beforced throughthe hose 20 into the smaller cylinder 8 and therefore compress. Thehandle 13 Will now be forced downwardly and the air will be forcedthrough the hose 22 into the tire or other desired receptacle. It willalso be noted that the piston in cylinder 7 will act as a check valvesince as handle 13 is pressed downwardly this piston will move upwardlyand the air will be allowed to pass between the flexible member 18 andthe side Walls of the cylinder 7.

Having thus described my invention what I claim as new is 1. Incombination, a base plate, a standard pivotally mounted thereon, ahandle pivotally mounted on the top of the standard, a pair of platesfixedly attached to the intermediate portion of the standard, linkspivotally carried by the plates, cylinders mounted on the links, pistonsin the cylinders, rods connecting the pistons with the handle, one

of said cylinders being larger than the other, a hose for communicatingthe cylinders with each other, and an outlet hose for the smallercylinder.

2. In combination, a base plate, a standard pivotally supported on thebase plate, a handle, a sleeve on the handle provided with parallelspaced lips, means for pivoting the standard between the lips, a pair ofcylin ders pivotally supported to the standard intermediate its ends,pistons in the cylinders,

rods connected to the pistons at one end, In testimony whereof I aflixmy signature means for pivoting the other ends of the rods in presenceof tWo Witnesses. to the lips oi: the sleeve on the handle, a hose FRANKA- JOHNSON.

for connecting the two cylinders, a check valve in said hose, and adelivery hose from Witnesses:

one of the cylinders in the manner and for I. S. THoMPsoN, the purposespecified. JULIUS F. MILLER.

